Congrats for getting the pup! You'll be having a great time together!
For puppy proofing, you can either go for off the shelf solutions like others mentioned or get a free standing fence built around the A/V furniture by the carpenter. Something like this,
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It need not be more than a foot tall. The gap between the vertical strips can also be made wider and the space in between can be covered in net. Don't need to spend a lot on it because, hopefully, you won't be needing it for more than a year.
Like
@manek already mentioned, it's just the teething phase. We got ours while our place was still under construction and we were living on rent. As we knew we'd be shifting between homes, we just had bare minimum furniture, all rented. He grew past the teething phase during this period. Then we were using a DIY amp and a pair of cheap speakers based on Ahuja drivers. They were already in pretty bad shape, so can't tell whether they had gone under his canines!
As he grew up, he has learnt to keep off whatever is dearest to every member in the family. Otherwise, he owns the rest of the place! For example, my better half doesn't like him playing with clothes (her clothes I mean) and, other than a thick jacket of hers, I haven't seen him carry around any of her clothes. As of me, I care little for my clothes, so you can often see him pulling one out from the heap on the ironing table and carrying it around. If we try to snatch it, he'll turn it into a game of tug of war!
For me, what matters most at home is of course the speakers, cables, rack, etc. Occasionally, while moving around the house, I could catch a glimpse of a wagging tail and a pair of naughty eyes staring at me, and there he will be, sitting dangerously close to a speaker, may be leaving just an mm of gap, waiting for me to scream! And scream I used to and he then calmly hops onto the couch with an unapologetic expression. I feel that it's his periodic test of my insanity!
There is also a corner, a couple of feet away from the speakers, where he chooses to settle down usually while I am not at home. My better half used to say that he must be missing me and the place at home is where he knows he could find a part of my soul that I'd have left behind!
With regards,
Sandeep Sasi